Using PostgreSQL as a Metastore
Seq stores two kinds of data. Log events are stored in Seq's event store. Documents, like users and signals are stored in a separate metastore, which may be Seq's built-in one, or a SQL database like SQL Server or PostgreSQL.
The built-in metastore is easy and self-contained, but an external PostgreSQL database may be more convenient if application data is already stored there, and can be more reliable if Seq's local filesystem is a network-based cloud filesystem.
Events aren't stored in the metastore
Seq won't store log events in the PostgreSQL database. Only documents like users and signals will be stored there. Since the metastore is usually small, even for large instances, you probably won't need to provision a large server for its documents.
Multiple Seq instances using the same Postgres metastore are not supported
You'll need to configure a (DR) Instance if you'd like to share a single metastore with multiple Seq instances.
Pointing Seq at a PostgreSQL database
metastore.postgres.connectionString configuration setting is given a non-null value then Seq will use that connection string as the source of the metastore.
In an init script:
seqsvr secret set -k metastore.postgres.connectionString -v "Host=example;Port=5432;Database=seq"
--value-stdin flag to pipe your connection string from a file or other source through
The connection string can also be specified in the
SEQ_METASTORE_POSTGRES_CONNECTIONSTRING environment variable.
The first time it runs, Seq will execute its migrations on the chosen schema.
Migrating an existing instance to the PostgreSQL metastore
As an example, say we want to use the connection string
Host=localhost;Port=5432;Database=seq. An existing Seq instance can be migrated to this SQL Server database using the
metastore to-postgresql command:
seqsvr metastore to-postgresql --connection-string "Host=example;Port=5432;Database=seq"
To see a full list of options that
to-postgresql accepts, run
seq help metastore to-postgresql.
Updated about 1 year ago